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Alternating Current and voltage

Question

An ac ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the ac ammeter reads 3 A. When another alternating current passes through the circuit, the ac ammeter reads 4 A. Then find the reading of this ammeter (in A), if dc and ac flow through the circuit simultaneously.

Moderate
Solution

Net current: I = 3+42 sin ωt

Now find Iv=0T(3+42sinωt)2dtT=5A



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A current is made up of two components 3A DC component and AC component given by I=4 sinωt. The effective value of current is


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